Diapositive 1

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Two lateral distributions sufficient for primary dose and
three for scatter dose. Only five convolutions per field!
1. Pre-calculate lateral dose distributions, Dk, for a selected set
of kernel parameters a z k, where k=1..n
2. Runtime operations per calculation point:
• Calculate radiological depth z ⇒ az
• Interpolate between lateral dose distributions, Dk and D k+1
1 1 1
2 k+1
2
(1 )
/ /
Inverse square factor
k
k k k k k k
z z
k z
z
z z z z z z z
z
a a
D A D
D S q q q
a A a A a a a
S
+ + +
  −
= −  +  =  
  −
 
=
calculation techniques:
interpolation scheme to save convolutions, example (primary dose):
This is the PK implementation in Oncentra